Science (and Math) 🧪

Biology

• DNA References
  • Rare Semi-Identical Twins Discovered (two sperm cells fertilized one egg which then split)
  • DNA Tests Could Reveal Unknown Proof of Incest
  • Unwinding DNA

Chemistry

• Periodic Table of Elements
• National Mole Day Foundation

Geography

• Pole of Inaccessibility, and Oceanic Poles of Inaccessibility (furthest point from land to ocean, or from ocean to land). I learned about this term reading an article in Bicycling magazine where two bicyclists meet midway between Europe and Asia, accidentally, riding in opposite directions. Oddly the riders names are Noel and Leon (opposites).

Mathematics

An Algebra Rules “Cheat Sheet” that I created to help my kids with math. Use it and pass it along.

• Information on the math constant “Pi”
  • Calculations of Pi (a couple of sample calculations)
  • Approximations of Pi (Wikipedia)
  • See also Wolfram Research’s info on Pi calculation
  • National Pi Day

Physics & Astronomy

• Rendition of a black hole, courtesy of the AstroSociety
  
• SkyMaps website, interesting for the basic astronomer (evening sky maps available)
  
• How GPS Receivers Work from How It Works
  
• Radio Frequency Spectrum
  
• Electromagnetic Spectrum, check out this NASA site!
  
• Electromagnetic Radiation (no bookmarks made thus far)
  
• BYJU’s Trigonometry Table

Miscellaneous

• Basics of the 4 Color (CMYK) Printing Process, and another link from Pantone
  
• Look at this “Units” conversion program
  
• How Differentials on an Automobile Work (From HowStuffWorks.com)